NEOTOMODON. 293 



and internally; third lower molar with two loops and one reentrant 

 angle externally, and one internal anterior loop and one reentrant 

 angle. 



FIG. 48. NEOTOMODON ALSTONI. 



No. 13887 Am. Mus. Nat. Hist. Coll. Enlarged M- 



UPPER TOOTH ROW. LOWER TOOTH ROW. 



Enlarged 7 times. Enlarged 7 times. 



KEY TO THE SPECIES. 



A. Ears large, nearly naked; tail short, fur soft, 



plantar tubercles, 6; mammae, 6. 

 a. Breast buffy. 



a.' Under parts white. PAGE 



a." Large; total length, 212 mm N. perotensis 293 



b." Small; total length, 194 mm N. orizaba 294 



b.' Under parts plumbeous, washed with 



white N. alstoni 294 



297. perotensis (Neotomodon), Merr., Proc. Biol. Soc. Wash., xn, 



1898, p. 129. 

 PEROTE WOOD RAT. 



Type locality. Cofre de Perote, State of Vera Cruz, Mexico. 

 Altitude, 9,500 feet. 



Geogr. Distr. State of Vera Cruz, Mexico. 



Genl. Char. Similar to N. alstoni, but ears and tail shorter. 



